The 426 kg deadlift looks to be done with an IPF bar, and the 440 kg WPO deadlift I know was done with an Oakie type of bar.
Look how easy he pulls the "warmup" on 390. 
426kg:
440 kg:
One thing's for certain.. Benni's a deadlifting monster.
-Hedge
You know, I really think Bennie is grossly overrated. His stunt of going "light" on the squat and bench then trying to pull big on the deadlift in a 3 lift meet pretty much did it in for me. Bolton and Frank both went all out when they set their records, and Bolton has gone all out again and again as he's pushed the records up. I respect that way, way more than schlemping on the squat and bench then pulling big in the deadlift.
The WABDL is out there for a reason. He could have pulled in that federation and just bypassed the squat. His record would have meant as much if you ask me.
All that said, Bennie is young yet. Hopefully things will come with time and he does put on a good show.
